We found 31 dictionaries that define the word rigorous:

General (28 matching dictionaries)

1. rigorous: Merriam-Webster.com
2. rigorous: Oxford Learner's Dictionaries
3. rigorous: American Heritage Dictionary of the English Language
4. rigorous: Collins English Dictionary
5. rigorous: Vocabulary.com
6. Rigorous, rigorous: Wordnik
7. rigorous: Cambridge Advanced Learner's Dictionary
8. rigorous: Wiktionary
9. rigorous: Webster's New World College Dictionary, 4th Ed.
10. rigorous: The Wordsmyth English Dictionary-Thesaurus
11. rigorous: Infoplease Dictionary
12. Rigorous, rigorous: Dictionary.com
13. rigorous: Cambridge Essential American English Dictionary
14. Rigorous: Online Plain Text English Dictionary
15. rigorous: Webster's Revised Unabridged, 1913 Edition
16. rigorous: Rhymezone
17. Rigorous: AllWords.com Multi-Lingual Dictionary
18. rigorous: Webster's 1828 Dictionary
19. rigorous: Free Dictionary
20. rigorous: Mnemonic Dictionary
21. rigorous: LookWAYup Translating Dictionary/Thesaurus
22. rigorous: Dictionary/thesaurus

Business (1 matching dictionary)

23. rigorous: Legal dictionary

Computing (1 matching dictionary)

24. rigorous: Encyclopedia

Science (1 matching dictionary)

25. Rigorous: Eric Weisstein's World of Mathematics

(Note: See rigorously as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Showing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough. ▸ adjective:  Severe; intense. Similar: stringent, demanding, tight, strict, cruel, brutal, exact, unkind, harsh, hard, more... Opposite: lenient, lax, easygoing, indulgent, permissive Types: tough, hard, challenging, arduous, formidable, strenuous, more... Phrases: Rigorous coupled-wave analysis, most rigorous, opposite of rigorous, non rigorous, make simpler or less rigorous, more... ▸ Words similar to rigorous ▸ Usage examples for rigorous ▸ Idioms related to rigorous ▸ Wikipedia articles (New!) ▸ Popular nouns described by rigorous ▸ Words that often appear near rigorous ▸ Rhymes of rigorous ▸ Invented words related to rigorous